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Research Papers
Laboratory of Cellular Carcinogenesis and Tumor Promotion, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892.
Abstract
To study the contribution of autocrine and paracrine TGF-beta 1 to tumor progression in a well-defined system of multistage carcinogenesis, keratinocytes with a targeted deletion of the TGF-beta 1 gene were initiated in vitro with the v-rasHa oncogene and their in vivo tumorigenic properties were determined by skin grafting initiated cells onto athymic mice in combination with either wild-type or null dermal fibroblasts. Grafts of v-rasHa-initiated null keratinocytes progressed rapidly to multifocal squamous cell carcinomas within dysplastic papillomas irrespective of the fibroblast genotype, whereas the initiated control genotypes formed well-differentiated papillomas. Malignant progression was not associated with mutations in the c-rasHa gene, alterations in p53 protein, or loss of responsiveness to TGF-beta 1. The tumor cell labeling index was elevated in grafts of initiated null keratinocytes with wild-type fibroblasts compared to tumors of other genotypes. However, labeling index in all tumors was reduced when TGF-beta 1 null fibroblasts formed the stroma. The null tumor cells could not accumulate TGF-beta 1 from the host, but grafts of uninitiated null keratinocytes, which formed a normal epidermis, became TGF-beta 1 positive even though they did not express TGF-beta 1 mRNA. These results demonstrate that autocrine TGF-beta 1 suppresses the frequency and rate of malignant progression, and that autocrine and paracrine TGF-beta 1 can have opposing effects on tumor cell proliferation. The lack of paracrine inhibition of tumor cell progression appears to result from the inability of tumor cells to localize host-derived TGF-beta 1 by a mechanism that operates in normal cells.
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